/*
Copyright 2014 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

//use for --watch-cache-sizes param of kube-apiserver
//make watch cache size of resources configurable
package cachesize

import (
	"strconv"
	"strings"

	"github.com/golang/glog"
)

type Resource string

const (
	CertificateSigningRequests Resource = "certificatesigningrequests"
	ClusterRoles               Resource = "clusterroles"
	ClusterRoleBindings        Resource = "clusterrolebindings"
	Controllers                Resource = "controllers"
	Daemonsets                 Resource = "daemonsets"
	Deployments                Resource = "deployments"
	Endpoints                  Resource = "endpoints"
	HorizontalPodAutoscalers   Resource = "horizontalpodautoscalers"
	Ingress                    Resource = "ingress"
	PodDisruptionBudget        Resource = "poddisruptionbudgets"
	PetSet                     Resource = "petset"
	Jobs                       Resource = "jobs"
	LimitRanges                Resource = "limitranges"
	Namespaces                 Resource = "namespaces"
	NetworkPolicys             Resource = "networkpolicies"
	Nodes                      Resource = "nodes"
	PersistentVolumes          Resource = "persistentvolumes"
	PersistentVolumeClaims     Resource = "persistentvolumeclaims"
	Pods                       Resource = "pods"
	PodTemplates               Resource = "podtemplates"
	Replicasets                Resource = "replicasets"
	ResourceQuotas             Resource = "resourcequotas"
	ScheduledJobs              Resource = "scheduledjobs"
	Roles                      Resource = "roles"
	RoleBindings               Resource = "rolebindings"
	Secrets                    Resource = "secrets"
	ServiceAccounts            Resource = "serviceaccounts"
	Services                   Resource = "services"
)

var watchCacheSizes map[Resource]int

func init() {
	watchCacheSizes = make(map[Resource]int)
	watchCacheSizes[CertificateSigningRequests] = 1000
	watchCacheSizes[ClusterRoles] = 100
	watchCacheSizes[ClusterRoleBindings] = 100
	watchCacheSizes[Controllers] = 100
	watchCacheSizes[Daemonsets] = 100
	watchCacheSizes[Deployments] = 100
	watchCacheSizes[Endpoints] = 1000
	watchCacheSizes[HorizontalPodAutoscalers] = 100
	watchCacheSizes[Ingress] = 100
	watchCacheSizes[PetSet] = 100
	watchCacheSizes[PodDisruptionBudget] = 100
	watchCacheSizes[Jobs] = 100
	watchCacheSizes[LimitRanges] = 100
	watchCacheSizes[Namespaces] = 100
	watchCacheSizes[NetworkPolicys] = 100
	watchCacheSizes[Nodes] = 1000
	watchCacheSizes[PersistentVolumes] = 100
	watchCacheSizes[PersistentVolumeClaims] = 100
	watchCacheSizes[Pods] = 1000
	watchCacheSizes[PodTemplates] = 100
	watchCacheSizes[Replicasets] = 100
	watchCacheSizes[ResourceQuotas] = 100
	watchCacheSizes[ScheduledJobs] = 100
	watchCacheSizes[Roles] = 100
	watchCacheSizes[RoleBindings] = 100
	watchCacheSizes[Secrets] = 100
	watchCacheSizes[ServiceAccounts] = 100
	watchCacheSizes[Services] = 100
}

func SetWatchCacheSizes(cacheSizes []string) {
	for _, c := range cacheSizes {
		tokens := strings.Split(c, "#")
		if len(tokens) != 2 {
			glog.Errorf("invalid value of watch cache capabilities: %s", c)
			continue
		}

		size, err := strconv.Atoi(tokens[1])
		if err != nil {
			glog.Errorf("invalid size of watch cache capabilities: %s", c)
			continue
		}

		watchCacheSizes[Resource(strings.ToLower(tokens[0]))] = size
	}
}

func GetWatchCacheSizeByResource(resource Resource) int {
	return watchCacheSizes[resource]
}
